column "{id}" is position-locked and cannot be grouped.

Warnings reference › columns.group.locked:*

Identifier

columns.group.locked:*

Raised by

The grid (core)

Since

1.29.0

What happened

Putting a column into a band moves it next to the band's other columns, and this column declares layout.lockPosition. The whole call is refused - nothing is grouped, not even the other columns in the list - so the tree is left exactly as it was rather than half-changed.

The fix

Leave the locked column out of the list, or clear its lockPosition.

Reference

Covered in full at the API reference.